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发明名称
摘要
申请公布号
JPH0319986(U)
申请公布日期
1991.02.27
申请号
JP19890079773U
申请日期
1989.07.06
申请人
发明人
分类号
G04B37/20;(IPC1-7):G04B37/20
主分类号
G04B37/20
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代理人
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地址
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